Yannis knew all about it, but he was fearless and stubborn, as people described him, willing to work hard and determined to succeed.

fearless 是由名词 fear（恐惧）加上否定后缀 -less 构成的形容词，字面意思是"没有恐惧的"，即"无畏的、勇敢的"。 stubborn 是形容词，意思是"固执的、倔强的"，指坚持己见不愿改变的性格特点。